1. FIBROUS OR IMMOVABLE JOINTS -
Occur between the bones of cranium & in the tooth suckets commonly in the form of sutures.
2. CARTILAGINOUR OR SLIGHTLY MOVABLE JOINTS -
Often called symphysis. Occur between vertebrae, at pubic symphysis and between ribs & sternum.
3. SYNOVIAL OR FREELY MOVABLE JOINTS -
Free movable joitns permit a great deal of movment.
At a synovial joint the adjacent bones are often so straped that, an enlargement of the one fits intodepression in the other.
A layer of hyaline cartilage, called articular cartilage covers the ends of the bones.
A space called the synovial cavity between 2 bones present.
Cavity is lined by fibrous synovial membrane containing secretory cells.
It secrets a thick, sticky fluid.
This fluid lubricate the joints to allow nearly friction less movement of bones on each other & also nourish the joints.
Within a synovial joint are small membrane bound packets, called bursae, that stores synovial fluid.
If fluid is secreted less, the joints become inflammeted & pariful. this condition is known as osteoarthritis.